Signal‐to‐Noise Ratio as a Function of Imaging Parameters

Azim Celik1, Weili Lin2

1 General Electric Company, Milwaukee, Wisconsin, 2 The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
Publication Name:  Current Protocols in Magnetic Resonance Imaging
Unit Number:  Unit B6.2
DOI:  10.1002/0471142719.mib0602s04
Online Posting Date:  May, 2002
GO TO THE FULL TEXT: PDF or HTML at Wiley Online Library

Abstract

Signal‐to‐Noise Ratio as a Function of Imaging Parameters (Azim Celik, General Electric Company, Milwaukee, Wisconsin and Weili Lin, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina). The degree to which noise affects a measurement is generally characterized by the signal‐to‐noise ratio (SNR, as measured by the ratio of the voxel signal to the noise standard deviation). This unit describes the importance of SNR in describing image quality. SNR is the key parameter for determining the quality of any given imaging experiment. If the SNR is not high enough, it becomes impossible to differentiate tissues from one another or the background. The dependence of SNR on imaging parameters such as the number of repetitions, the number of k‐space samples (Nx, Ny, and Nz), the readout bandwidth, and voxel dimensions (Dx, Dy, and Dz) is explained in detail.

     
 
GO TO THE FULL PROTOCOL:
PDF or HTML at Wiley Online Library

Table of Contents

  • Overview
  • Technical Discussion
  • Figures
  • Tables
     
 
GO TO THE FULL PROTOCOL:
PDF or HTML at Wiley Online Library

Materials

GO TO THE FULL PROTOCOL:
PDF or HTML at Wiley Online Library

Figures

Videos

Literature Cited

Key References
   Escanyé, J.M., Canet, D., and Robert, J. 1982. Frequency dependence of water proton longitudinal nuclear magnetic relaxation times in mouse tissues at 20°C. Biochim. Biophys. Acta 721:305.
  The square root field strength dependence of T1 was proposed in this article.
   Haacke, E.M., Brown, R.W., Thompson, M.R., and Venkatesan, R. 1999. Magnetic Resonance Imaging: Physical Principles and Sequence Design. John Wiley & Sons, New York.
  The SNR as a function of imaging parameters and field strength is described in detail in this text.
GO TO THE FULL PROTOCOL:
PDF or HTML at Wiley Online Library